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What is the area of a circle with a circumference of 14π inches?

admin2013-02-19  2
问题 What is the area of a circle with a circumference of 14π inches?
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答案49π
解析 The equation for the area of a circle is A = πr2. The equation for the circumference of a circle is C = 2πr. Since you are given the circumference, you can use that to find the radius, r, and then use the radius to find the area:
14π=πr
14 = 2r
r = 7
Now substitute r into the equation for area:
Area = π(72)
Area = 49π
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